Exercise 2-7 (Algo) Job-Order Costing; Working Backwards [LO2-1, LO2-2, LO2-3] Hahn Company uses a job-order costing system. Its plantwide predetermined overhead rate uses direct labor-hours as the allocation base. The company pays its direct laborers $19.50 per hour. During the year, the company started and completed only two jobs-Job Alpha, which used 55,900 direct labor-hours, and Job Omega. The job cost sheets for these two jobs are shown below: Required: 1. Calculate the plantwide predetermined overhead rate. 2. Complete the job cost sheet for Job Alpha